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                                <h1 id="childprocess">child_process</h1>
<p>&#x2002;&#x2002;node&#x9075;&#x5FAA;&#x7684;&#x662F;&#x5355;&#x7EBF;&#x7A0B;&#x5355;&#x8FDB;&#x7A0B;&#x7684;&#x6A21;&#x5F0F;&#xFF0C;node&#x7684;&#x5355;&#x7EBF;&#x7A0B;&#x662F;&#x6307;js&#x7684;&#x5F15;&#x64CE;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x5B9E;&#x4F8B;&#xFF0C;&#x4E14;&#x5728;nodejs&#x7684;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E2D;&#x6267;&#x884C;&#xFF0C;&#x540C;&#x65F6;node&#x4EE5;&#x4E8B;&#x4EF6;&#x9A71;&#x52A8;&#x7684;&#x65B9;&#x5F0F;&#x5904;&#x7406;IO&#x7B49;&#x5F02;&#x6B65;&#x64CD;&#x4F5C;&#x3002;node&#x7684;&#x5355;&#x7EBF;&#x7A0B;&#x6A21;&#x5F0F;&#xFF0C;&#x53EA;&#x7EF4;&#x6301;&#x4E00;&#x4E2A;&#x4E3B;&#x7EBF;&#x7A0B;&#xFF0C;&#x5927;&#x5927;&#x51CF;&#x5C11;&#x4E86;&#x7EBF;&#x7A0B;&#x95F4;&#x5207;&#x6362;&#x7684;&#x5F00;&#x9500;&#x3002;</p>
<p>&#x2002;&#x2002;&#x4F46;&#x662F;node&#x7684;&#x5355;&#x7EBF;&#x7A0B;&#x4F7F;&#x5F97;&#x5728;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0D;&#x80FD;&#x8FDB;&#x884C;CPU&#x5BC6;&#x96C6;&#x578B;&#x64CD;&#x4F5C;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x963B;&#x585E;&#x4E3B;&#x7EBF;&#x7A0B;&#x3002;&#x5BF9;&#x4E8E;CPU&#x5BC6;&#x96C6;&#x578B;&#x64CD;&#x4F5C;&#xFF0C;&#x5728;node&#x4E2D;&#x901A;&#x8FC7;child_process&#x53EF;&#x4EE5;&#x521B;&#x5EFA;&#x72EC;&#x7ACB;&#x7684;&#x5B50;&#x8FDB;&#x7A0B;&#xFF0C;&#x7236;&#x5B50;&#x8FDB;&#x7A0B;&#x901A;&#x8FC7;IPC&#x901A;&#x4FE1;&#xFF0C;&#x5B50;&#x8FDB;&#x7A0B;&#x53EF;&#x4EE5;&#x662F;&#x5916;&#x90E8;&#x5E94;&#x7528;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;node&#x5B50;&#x7A0B;&#x5E8F;&#xFF0C;&#x5B50;&#x8FDB;&#x7A0B;&#x6267;&#x884C;&#x540E;&#x53EF;&#x4EE5;&#x5C06;&#x7ED3;&#x679C;&#x8FD4;&#x56DE;&#x7ED9;&#x7236;&#x8FDB;&#x7A0B;&#x3002;</p>
<p>&#x2002;&#x6211;&#x4EEC;&#x5E73;&#x65F6;&#x6240;&#x8BF4;&#x7684;&#x5355;&#x7EBF;&#x7A0B;&#x662F;&#x6307;node&#x4E2D;&#x53EA;&#x6709;&#x4E00;&#x4E2A;js&#x5F15;&#x64CE;&#x5728;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0A;&#x8FD0;&#x884C;&#x3002;&#x5176;&#x4ED6;&#x5F02;&#x6B65;IO&#x548C;&#x4E8B;&#x4EF6;&#x9A71;&#x52A8;&#x76F8;&#x5173;&#x7684;&#x7EBF;&#x7A0B;&#x901A;&#x8FC7;libuv&#x6765;&#x5B9E;&#x73B0;&#x5185;&#x90E8;&#x7684;&#x7EBF;&#x7A0B;&#x6C60;&#x548C;&#x7EBF;&#x7A0B;&#x8C03;&#x5EA6;&#x3002;libv&#x4E2D;&#x5B58;&#x5728;&#x4E86;&#x4E00;&#x4E2A;Event Loop&#xFF0C;&#x901A;&#x8FC7;Event Loop&#x6765;&#x5207;&#x6362;&#x5B9E;&#x73B0;&#x7C7B;&#x4F3C;&#x4E8E;&#x591A;&#x7EBF;&#x7A0B;&#x7684;&#x6548;&#x679C;&#x3002;&#x7B80;&#x5355;&#x7684;&#x6765;&#x8BB2;Event Loop&#x5C31;&#x662F;&#x7EF4;&#x6301;&#x4E00;&#x4E2A;&#x6267;&#x884C;&#x6808;&#x548C;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#x961F;&#x5217;&#xFF0C;&#x5F53;&#x524D;&#x6267;&#x884C;&#x6808;&#x4E2D;&#x7684;&#x5982;&#x679C;&#x53D1;&#x73B0;&#x5F02;&#x6B65;IO&#x4EE5;&#x53CA;&#x5B9A;&#x65F6;&#x5668;&#x7B49;&#x51FD;&#x6570;&#xFF0C;&#x5C31;&#x4F1A;&#x628A;&#x8FD9;&#x4E9B;&#x5F02;&#x6B65;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x653E;&#x5165;&#x5230;&#x4E8B;&#x4EF6;&#x961F;&#x5217;&#x4E2D;&#x3002;&#x5F53;&#x524D;&#x6267;&#x884C;&#x6808;&#x6267;&#x884C;&#x5B8C;&#x6210;&#x540E;&#xFF0C;&#x4ECE;&#x4E8B;&#x4EF6;&#x961F;&#x5217;&#x4E2D;&#xFF0C;&#x6309;&#x7167;&#x4E00;&#x5B9A;&#x7684;&#x987A;&#x5E8F;&#x6267;&#x884C;&#x4E8B;&#x4EF6;&#x961F;&#x5217;&#x4E2D;&#x7684;&#x5F02;&#x6B65;&#x56DE;&#x8C03;&#x51FD;&#x6570;&#x3002;</p>
<hr>
<h3 id="&#x521B;&#x5EFA;&#x5B50;&#x8FDB;&#x7A0B;">&#x521B;&#x5EFA;&#x5B50;&#x8FDB;&#x7A0B;</h3>
<p>child_process&#x63D0;&#x4F9B;&#x4E86;4&#x4E2A;&#x65B9;&#x6CD5;&#xFF0C;&#x7528;&#x4E8E;&#x65B0;&#x5EFA;&#x5B50;&#x8FDB;&#x7A0B;&#xFF0C;&#x8FD9;4&#x4E2A;&#x65B9;&#x6CD5;&#x5206;&#x522B;&#x4E3A;spawn&#x3001;execFile&#x3001;exec&#x548C;fork&#xFF0C;&#x6240;&#x6709;&#x7684;&#x65B9;&#x6CD5;&#x90FD;&#x662F;&#x5F02;&#x6B65;&#x3002;</p>
<ul>
<li><strong>spawn</strong> &#xFF1A; &#x5B50;&#x8FDB;&#x7A0B;&#x4E2D;&#x6267;&#x884C;&#x7684;&#x662F;&#x975E;node&#x7A0B;&#x5E8F;&#xFF0C;&#x63D0;&#x4F9B;&#x4E00;&#x7EC4;&#x53C2;&#x6570;&#x540E;&#xFF0C;&#x6267;&#x884C;&#x7684;&#x7ED3;&#x679C;&#x4EE5;&#x6D41;&#x7684;&#x5F62;&#x5F0F;&#x8FD4;&#x56DE;&#x3002;</li>
<li><strong>execFile</strong>&#xFF1A;&#x5B50;&#x8FDB;&#x7A0B;&#x4E2D;&#x6267;&#x884C;&#x7684;&#x662F;&#x975E;node&#x7A0B;&#x5E8F;&#xFF0C;&#x63D0;&#x4F9B;&#x4E00;&#x7EC4;&#x53C2;&#x6570;&#x540E;&#xFF0C;&#x6267;&#x884C;&#x7684;&#x7ED3;&#x679C;&#x4EE5;&#x56DE;&#x8C03;&#x7684;&#x5F62;&#x5F0F;&#x8FD4;&#x56DE;&#x3002;</li>
<li><strong>exec</strong>&#xFF1A;&#x5B50;&#x8FDB;&#x7A0B;&#x6267;&#x884C;&#x7684;&#x662F;&#x975E;node&#x7A0B;&#x5E8F;&#xFF0C;&#x4F20;&#x5165;&#x4E00;&#x4E32;shell&#x547D;&#x4EE4;&#xFF0C;&#x6267;&#x884C;&#x540E;&#x7ED3;&#x679C;&#x4EE5;&#x56DE;&#x8C03;&#x7684;&#x5F62;&#x5F0F;&#x8FD4;&#x56DE;&#xFF0C;&#x4E0E;execFile 
&#x4E0D;&#x540C;&#x7684;&#x662F;exec&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x6267;&#x884C;&#x4E00;&#x4E32;shell&#x547D;&#x4EE4;&#x3002;</li>
<li><strong>fork</strong>&#xFF1A;&#x5B50;&#x8FDB;&#x7A0B;&#x6267;&#x884C;&#x7684;&#x662F;node&#x7A0B;&#x5E8F;&#xFF0C;&#x63D0;&#x4F9B;&#x4E00;&#x7EC4;&#x53C2;&#x6570;&#x540E;&#xFF0C;&#x6267;&#x884C;&#x7684;&#x7ED3;&#x679C;&#x4EE5;&#x6D41;&#x7684;&#x5F62;&#x5F0F;&#x8FD4;&#x56DE;&#xFF0C;&#x4E0E;spawn&#x4E0D;&#x540C;&#xFF0C;fork&#x751F;&#x6210;&#x7684;&#x5B50;&#x8FDB;&#x7A0B;&#x53EA;&#x80FD;&#x6267;&#x884C;node&#x5E94;&#x7528;&#x3002;&#x63A5;&#x4E0B;&#x6765;&#x7684;&#x5C0F;&#x8282;&#x5C06;&#x5177;&#x4F53;&#x7684;&#x4ECB;&#x7ECD;&#x8FD9;&#x4E00;&#x4E9B;&#x65B9;&#x6CD5;&#x3002;</li>
</ul>
<hr>
<h4 id="spawn">spawn</h4>
<p>&#x793A;&#x4F8B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> childProcess = <span class="hljs-built_in">require</span>(<span class="hljs-string">&quot;child_process&quot;</span>);

<span class="hljs-keyword">const</span> hello = childProcess.spawn(<span class="hljs-string">&quot;echo&quot;</span>,[<span class="hljs-string">&apos;hello&apos;</span>,<span class="hljs-string">&apos;world&apos;</span>]);
hello.stdout.pipe(process.stdout);
</code></pre>
<p>&#x8FD0;&#x884C;shell&#x547D;&#x4EE4;echo&#xFF08;&#x6253;&#x5370;&#xFF09;,&#x53C2;&#x6570;&#x7528;&#x6570;&#x7EC4;&#x5305;&#x542B;&#xFF0C;&#x4E0D;&#x76F4;&#x63A5;&#x6267;&#x884C; echo hello world,&#x662F;&#x4E3A;&#x4E86;&#x9632;&#x6B62;&#x6CE8;&#x5165;&#x653B;&#x51FB;&#xFF0C;&#x5C06;&#x6D41;&#x5BFC;&#x5165;&#x63A7;&#x5236;&#x53F0;&#x7684;&#x8F93;&#x51FA;&#x3002;&#x7136;&#x540E;&#x63A7;&#x5236;&#x53F0;&#x4F1A;&#x6253;&#x5370; hello world.</p>
<hr>
<h4 id="exec">exec</h4>
<p>&#x793A;&#x4F8B;&#xFF1A;</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> childProcess = <span class="hljs-built_in">require</span>(<span class="hljs-string">&quot;child_process&quot;</span>);

childProcess.exec(<span class="hljs-string">&quot;echo hello world&quot;</span>,(error,stdout)=&gt;{
    <span class="hljs-keyword">if</span> (error) {
        <span class="hljs-built_in">console</span>.log(error);
    }<span class="hljs-keyword">else</span> {
        <span class="hljs-built_in">console</span>.log(stdout);
    }
});
</code></pre>
<p><code>exec</code>,&#x5C31;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x8FD0;&#x884C;shell&#x547D;&#x4EE4;&#xFF0C;&#x4F46;&#x662F;&#x8FD9;&#x6837;&#x6BD4;&#x8F83;&#x5371;&#x9669;&#x3002;&#x5982;&#x679C;&#x5728;&#x540E;&#x9762;&#x53C8;&#x52A0;&#x4E86;&#x4E00;&#x6761;rm&#x6307;&#x4EE4;&#xFF0C;&#x5C31;&#x6709;&#x610F;&#x601D;&#x4E86;&#x3002;&#x6240;&#x6709;&#x4E3A;&#x4E86;&#x8BA9;&#x7A0B;&#x5E8F;&#x6309;&#x7167;&#x6211;&#x4EEC;&#x9884;&#x671F;&#x7684;&#x8FD0;&#x884C;&#xFF0C;&#x5EFA;&#x8BAE;&#x4E0D;&#x7528;exec&#xFF0C;&#x53EF;&#x4EE5;&#x7528;execFile&#x4EE3;&#x66FF;&#x3002;</p>
<p>&#x6240;&#x4EE5;&#x6709;&#x4E86;execFile&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x9632;&#x6B62;&#x6CE8;&#x5165;&#x653B;&#x51FB;&#x3002;</p>
<hr>
<h4 id="execfile">execFile</h4>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> childProcess = <span class="hljs-built_in">require</span>(<span class="hljs-string">&quot;child_process&quot;</span>);

childProcess.execFile(<span class="hljs-string">&apos;echo&apos;</span>,[<span class="hljs-string">&apos;hello&apos;</span>,<span class="hljs-string">&apos;world&apos;</span>],(error,stdout)=&gt;{
    <span class="hljs-keyword">if</span> (error) {
        <span class="hljs-built_in">console</span>.log(error);
    }<span class="hljs-keyword">else</span> {
        <span class="hljs-built_in">console</span>.log(stdout);
    }
});
</code></pre>
<p>&#x4E0E;exec&#x76F8;&#x6BD4;&#xFF0C;&#x53C2;&#x6570;&#x662F;&#x4EE5;&#x6570;&#x7EC4;&#x7684;&#x65B9;&#x5F0F;&#x4F20;&#x5165;&#x3002;</p>
<hr>
<h4 id="fork">fork</h4>
<p>&#x524D;&#x9762;&#x7684;&#x90FD;&#x662F;&#x8FD0;&#x884C; shell &#x7A0B;&#x5E8F;&#xFF0C;<code>fork</code>&#x53EF;&#x4EE5;&#x8FD0;&#x884C;node&#x5B50;&#x8FDB;&#x7A0B;&#xFF0C;&#x5E76;&#x4E14;&#x53EF;&#x4EE5;&#x4E0E;&#x7236;&#x8FDB;&#x7A0B;&#x8FDB;&#x884C;&#x901A;&#x4FE1;&#x3002;</p>
<p>&#x793A;&#x4F8B;&#xFF1A;</p>
<p>fork-child.js:</p>
<pre><code class="lang-js"><span class="hljs-built_in">console</span>.log(<span class="hljs-string">`I am child`</span>);
process.send(<span class="hljs-string">&quot;hello parent&quot;</span>);
process.on(<span class="hljs-string">`message`</span>,message=&gt;{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">`child receive: <span class="hljs-subst">${message}</span>`</span>);
});
</code></pre>
<p>parent:</p>
<pre><code class="lang-js"><span class="hljs-keyword">const</span> childProcess = <span class="hljs-built_in">require</span>(<span class="hljs-string">&quot;child_process&quot;</span>);

<span class="hljs-built_in">console</span>.log(<span class="hljs-string">`I am parent`</span>);
<span class="hljs-keyword">const</span> spawn = childProcess.fork(<span class="hljs-string">&quot;./fork-child&quot;</span>);
spawn.on(<span class="hljs-string">&apos;message&apos;</span>,message=&gt;{
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">`parent receive: <span class="hljs-subst">${message}</span>`</span>);
    spawn.send(<span class="hljs-string">&quot;hello child&quot;</span>);
});
</code></pre>
<p>&#x8FD0;&#x884C;parent&#xFF1A;</p>
<pre><code class="lang-shell">I am parent
I am child
parent receive: hello parent
child receive: hello child
</code></pre>
<p>&#x4E0A;&#x9762;&#x7A0B;&#x5E8F;&#x662F;&#xFF0C;&#x5148;&#x662F;fork&#x4E86;&#x4E00;&#x4E2A;&#x5B50;&#x8FDB;&#x7A0B;&#xFF0C;&#x5B50;&#x8FDB;&#x7A0B;&#x5C31;&#x8FD0;&#x884C;&#x4E86;&#xFF0C;&#x7136;&#x540E;&#x5B50;&#x8FDB;&#x7A0B;&#x5411;&#x7236;&#x8FDB;&#x7A0B;&#x53D1;&#x9001;&#x6D88;&#x606F;&#xFF0C;parent&#x76D1;&#x542C;&#x5230;&#x4E86;&#x5E76;&#x6253;&#x5370;&#xFF0C;&#x5E76;&#x5411;child&#x53D1;&#x9001;&#x4E86;&#x4E00;&#x6761;&#x6D88;&#x606F;&#xFF0C;child&#x4E5F;&#x76D1;&#x542C;&#x5230;&#x4E86;&#x5E76;&#x6253;&#x5370;&#x4E86;&#x7236;&#x8FDB;&#x7A0B;&#x53D1;&#x9001;&#x7684;&#x6D88;&#x606F;&#x3002;</p>

                                
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